//Test the random number generator for randomness
#include <iostream>
using namespace std;
#include <time.h>

int main() {
double lower; double upper;
int rnum; int rsum; int total;
int countr[32767];

cout << "enter a lower bound: ";
cin >> lower;
cout << "enter an upper bound: ";
cin >> upper;
cout << "enter then # of random numbers: ";
cin >> total;

//init counter array
for (int i=lower; i<=upper; i++) {
	countr[i] = 0;
}//end for

srand(time(NULL));		//see random number generator
cout << "RAND_MAX = " << RAND_MAX << endl;

	int startTime = time(0);	//start the timer
	cout << "start time = " << startTime << endl;

//generate random numbers in the specified range
rsum = 0;
for(i=1; i<=total; i++) {
	rnum = rand();
	rnum = rnum*(upper-lower+1)/RAND_MAX + lower; 
	//rsum = rsum + rnum;
	//cout << rnum << endl;
	countr[rnum]++;
}//end for
//cout << "averge of random = " << rsum/15 << endl;
//cout << "average of upper and lower = " << (lower+upper-1)/2 << endl;

  	int endTime = time(0);
	cout << "end time = " << endTime << endl;
	cout << "elapsed time = " << endTime - startTime << endl;

//write counter array
for (i=lower; i<=upper; i++) {
	cout << i << '-' << countr[i] << endl;
}//end for

return 0;
}//end main